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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2011 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: AbstractDAO.DAOCriteriaUniqueCallback.html 740 2013-10-02 21:27:31Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.dellroad.stuff.dao;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import java.util.List;<a name="line.10"></a>
<span class="sourceLineNo">011</span><a name="line.11"></a>
<span class="sourceLineNo">012</span>import javax.persistence.EntityManager;<a name="line.12"></a>
<span class="sourceLineNo">013</span>import javax.persistence.FlushModeType;<a name="line.13"></a>
<span class="sourceLineNo">014</span>import javax.persistence.NoResultException;<a name="line.14"></a>
<span class="sourceLineNo">015</span>import javax.persistence.PersistenceContext;<a name="line.15"></a>
<span class="sourceLineNo">016</span>import javax.persistence.TypedQuery;<a name="line.16"></a>
<span class="sourceLineNo">017</span>import javax.persistence.criteria.CriteriaBuilder;<a name="line.17"></a>
<span class="sourceLineNo">018</span>import javax.persistence.criteria.CriteriaQuery;<a name="line.18"></a>
<span class="sourceLineNo">019</span><a name="line.19"></a>
<span class="sourceLineNo">020</span>import org.dellroad.stuff.spring.AbstractBean;<a name="line.20"></a>
<span class="sourceLineNo">021</span>import org.springframework.dao.EmptyResultDataAccessException;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import org.springframework.transaction.support.TransactionSynchronizationManager;<a name="line.22"></a>
<span class="sourceLineNo">023</span><a name="line.23"></a>
<span class="sourceLineNo">024</span>/**<a name="line.24"></a>
<span class="sourceLineNo">025</span> * Support superclass for JPA DAO implementations.<a name="line.25"></a>
<span class="sourceLineNo">026</span> *<a name="line.26"></a>
<span class="sourceLineNo">027</span> * @param &lt;T&gt; persistent instance type<a name="line.27"></a>
<span class="sourceLineNo">028</span> * @see org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor<a name="line.28"></a>
<span class="sourceLineNo">029</span> */<a name="line.29"></a>
<span class="sourceLineNo">030</span>public abstract class AbstractDAO&lt;T&gt; extends AbstractBean implements DAO&lt;T&gt; {<a name="line.30"></a>
<span class="sourceLineNo">031</span><a name="line.31"></a>
<span class="sourceLineNo">032</span>    /**<a name="line.32"></a>
<span class="sourceLineNo">033</span>     * Persistent instance type.<a name="line.33"></a>
<span class="sourceLineNo">034</span>     */<a name="line.34"></a>
<span class="sourceLineNo">035</span>    protected final Class&lt;T&gt; type;<a name="line.35"></a>
<span class="sourceLineNo">036</span><a name="line.36"></a>
<span class="sourceLineNo">037</span>    /**<a name="line.37"></a>
<span class="sourceLineNo">038</span>     * The configured {@link EntityManager}.<a name="line.38"></a>
<span class="sourceLineNo">039</span>     */<a name="line.39"></a>
<span class="sourceLineNo">040</span>    private EntityManager entityManager;<a name="line.40"></a>
<span class="sourceLineNo">041</span><a name="line.41"></a>
<span class="sourceLineNo">042</span>    /**<a name="line.42"></a>
<span class="sourceLineNo">043</span>     * Constructor.<a name="line.43"></a>
<span class="sourceLineNo">044</span>     *<a name="line.44"></a>
<span class="sourceLineNo">045</span>     * @param type persistent instance type<a name="line.45"></a>
<span class="sourceLineNo">046</span>     */<a name="line.46"></a>
<span class="sourceLineNo">047</span>    protected AbstractDAO(Class&lt;T&gt; type) {<a name="line.47"></a>
<span class="sourceLineNo">048</span>        if (type == null)<a name="line.48"></a>
<span class="sourceLineNo">049</span>            throw new IllegalArgumentException("null type");<a name="line.49"></a>
<span class="sourceLineNo">050</span>        this.type = type;<a name="line.50"></a>
<span class="sourceLineNo">051</span>    }<a name="line.51"></a>
<span class="sourceLineNo">052</span><a name="line.52"></a>
<span class="sourceLineNo">053</span>// Configuration and lifecycle methods<a name="line.53"></a>
<span class="sourceLineNo">054</span><a name="line.54"></a>
<span class="sourceLineNo">055</span>    /**<a name="line.55"></a>
<span class="sourceLineNo">056</span>     * Get the configured {@link EntityManager}.<a name="line.56"></a>
<span class="sourceLineNo">057</span>     */<a name="line.57"></a>
<span class="sourceLineNo">058</span>    protected EntityManager getEntityManager() {<a name="line.58"></a>
<span class="sourceLineNo">059</span>        return this.entityManager;<a name="line.59"></a>
<span class="sourceLineNo">060</span>    }<a name="line.60"></a>
<span class="sourceLineNo">061</span><a name="line.61"></a>
<span class="sourceLineNo">062</span>    /**<a name="line.62"></a>
<span class="sourceLineNo">063</span>     * Set the configured {@link EntityManager}.<a name="line.63"></a>
<span class="sourceLineNo">064</span>     *<a name="line.64"></a>
<span class="sourceLineNo">065</span>     * &lt;p&gt;<a name="line.65"></a>
<span class="sourceLineNo">066</span>     * This method has a {@link PersistenceContext @PersistenceContext} annotation and normally<a name="line.66"></a>
<span class="sourceLineNo">067</span>     * would be invoked automatically by Spring.<a name="line.67"></a>
<span class="sourceLineNo">068</span>     */<a name="line.68"></a>
<span class="sourceLineNo">069</span>    @PersistenceContext<a name="line.69"></a>
<span class="sourceLineNo">070</span>    public void setEntityManager(EntityManager entityManager) {<a name="line.70"></a>
<span class="sourceLineNo">071</span>        this.entityManager = entityManager;<a name="line.71"></a>
<span class="sourceLineNo">072</span>    }<a name="line.72"></a>
<span class="sourceLineNo">073</span><a name="line.73"></a>
<span class="sourceLineNo">074</span>    @Override<a name="line.74"></a>
<span class="sourceLineNo">075</span>    public void afterPropertiesSet() throws Exception {<a name="line.75"></a>
<span class="sourceLineNo">076</span>        super.afterPropertiesSet();<a name="line.76"></a>
<span class="sourceLineNo">077</span>        if (this.getEntityManager() == null)<a name="line.77"></a>
<span class="sourceLineNo">078</span>            throw new IllegalArgumentException("no entityManager configured");<a name="line.78"></a>
<span class="sourceLineNo">079</span>    }<a name="line.79"></a>
<span class="sourceLineNo">080</span><a name="line.80"></a>
<span class="sourceLineNo">081</span>// Meta-data methods<a name="line.81"></a>
<span class="sourceLineNo">082</span><a name="line.82"></a>
<span class="sourceLineNo">083</span>    @Override<a name="line.83"></a>
<span class="sourceLineNo">084</span>    public Class&lt;T&gt; getType() {<a name="line.84"></a>
<span class="sourceLineNo">085</span>        return this.type;<a name="line.85"></a>
<span class="sourceLineNo">086</span>    }<a name="line.86"></a>
<span class="sourceLineNo">087</span><a name="line.87"></a>
<span class="sourceLineNo">088</span>// Access methods<a name="line.88"></a>
<span class="sourceLineNo">089</span><a name="line.89"></a>
<span class="sourceLineNo">090</span>    @Override<a name="line.90"></a>
<span class="sourceLineNo">091</span>    public T getById(long id) {<a name="line.91"></a>
<span class="sourceLineNo">092</span>        return this.getEntityManager().find(this.type, id);<a name="line.92"></a>
<span class="sourceLineNo">093</span>    }<a name="line.93"></a>
<span class="sourceLineNo">094</span><a name="line.94"></a>
<span class="sourceLineNo">095</span>    @Override<a name="line.95"></a>
<span class="sourceLineNo">096</span>    public List&lt;T&gt; getAll() {<a name="line.96"></a>
<span class="sourceLineNo">097</span>        return this.getBy(new DAOCriteriaListCallback() {<a name="line.97"></a>
<span class="sourceLineNo">098</span>            @Override<a name="line.98"></a>
<span class="sourceLineNo">099</span>            protected void configureQuery(CriteriaQuery&lt;T&gt; criteriaQuery, CriteriaBuilder criteriaBuilder) {<a name="line.99"></a>
<span class="sourceLineNo">100</span>                criteriaQuery.from(this.type);<a name="line.100"></a>
<span class="sourceLineNo">101</span>            }<a name="line.101"></a>
<span class="sourceLineNo">102</span>        });<a name="line.102"></a>
<span class="sourceLineNo">103</span>    }<a name="line.103"></a>
<span class="sourceLineNo">104</span><a name="line.104"></a>
<span class="sourceLineNo">105</span>    @Override<a name="line.105"></a>
<span class="sourceLineNo">106</span>    public T getReference(long id) {<a name="line.106"></a>
<span class="sourceLineNo">107</span>        return this.getEntityManager().getReference(this.type, id);<a name="line.107"></a>
<span class="sourceLineNo">108</span>    }<a name="line.108"></a>
<span class="sourceLineNo">109</span><a name="line.109"></a>
<span class="sourceLineNo">110</span>    /**<a name="line.110"></a>
<span class="sourceLineNo">111</span>     * Find instances using a query string and query parameters.<a name="line.111"></a>
<span class="sourceLineNo">112</span>     */<a name="line.112"></a>
<span class="sourceLineNo">113</span>    protected List&lt;T&gt; find(final String queryString, final Object... params) {<a name="line.113"></a>
<span class="sourceLineNo">114</span>        return this.getBy(new DAOQueryListCallback() {<a name="line.114"></a>
<span class="sourceLineNo">115</span>            @Override<a name="line.115"></a>
<span class="sourceLineNo">116</span>            protected TypedQuery&lt;T&gt; buildQuery(EntityManager em) {<a name="line.116"></a>
<span class="sourceLineNo">117</span>                return AbstractDAO.this.buildQuery(em, queryString, params);<a name="line.117"></a>
<span class="sourceLineNo">118</span>            }<a name="line.118"></a>
<span class="sourceLineNo">119</span>        });<a name="line.119"></a>
<span class="sourceLineNo">120</span>    }<a name="line.120"></a>
<span class="sourceLineNo">121</span><a name="line.121"></a>
<span class="sourceLineNo">122</span>    /**<a name="line.122"></a>
<span class="sourceLineNo">123</span>     * Find a unique instance using a query string and query parameters.<a name="line.123"></a>
<span class="sourceLineNo">124</span>     *<a name="line.124"></a>
<span class="sourceLineNo">125</span>     * @return unique instance found, or null if none was found<a name="line.125"></a>
<span class="sourceLineNo">126</span>     */<a name="line.126"></a>
<span class="sourceLineNo">127</span>    protected T findUnique(final String queryString, final Object... params) {<a name="line.127"></a>
<span class="sourceLineNo">128</span>        return this.getBy(new DAOQueryUniqueCallback() {<a name="line.128"></a>
<span class="sourceLineNo">129</span>            @Override<a name="line.129"></a>
<span class="sourceLineNo">130</span>            protected TypedQuery&lt;T&gt; buildQuery(EntityManager em) {<a name="line.130"></a>
<span class="sourceLineNo">131</span>                return AbstractDAO.this.buildQuery(em, queryString, params);<a name="line.131"></a>
<span class="sourceLineNo">132</span>            }<a name="line.132"></a>
<span class="sourceLineNo">133</span>        });<a name="line.133"></a>
<span class="sourceLineNo">134</span>    }<a name="line.134"></a>
<span class="sourceLineNo">135</span><a name="line.135"></a>
<span class="sourceLineNo">136</span>    /**<a name="line.136"></a>
<span class="sourceLineNo">137</span>     * Search using a {@link QueryCallback}.<a name="line.137"></a>
<span class="sourceLineNo">138</span>     */<a name="line.138"></a>
<span class="sourceLineNo">139</span>    protected &lt;R&gt; R getBy(QueryCallback&lt;R&gt; callback) {<a name="line.139"></a>
<span class="sourceLineNo">140</span>        return callback.query(this.getEntityManager());<a name="line.140"></a>
<span class="sourceLineNo">141</span>    }<a name="line.141"></a>
<span class="sourceLineNo">142</span><a name="line.142"></a>
<span class="sourceLineNo">143</span>    /**<a name="line.143"></a>
<span class="sourceLineNo">144</span>     * Perform a bulk update.<a name="line.144"></a>
<span class="sourceLineNo">145</span>     */<a name="line.145"></a>
<span class="sourceLineNo">146</span>    protected int bulkUpdate(UpdateCallback callback) {<a name="line.146"></a>
<span class="sourceLineNo">147</span>        return callback.query(this.getEntityManager());<a name="line.147"></a>
<span class="sourceLineNo">148</span>    }<a name="line.148"></a>
<span class="sourceLineNo">149</span><a name="line.149"></a>
<span class="sourceLineNo">150</span>// Lifecycle methods<a name="line.150"></a>
<span class="sourceLineNo">151</span><a name="line.151"></a>
<span class="sourceLineNo">152</span>    @Override<a name="line.152"></a>
<span class="sourceLineNo">153</span>    public void save(T obj) {<a name="line.153"></a>
<span class="sourceLineNo">154</span>        this.getEntityManager().persist(obj);<a name="line.154"></a>
<span class="sourceLineNo">155</span>    }<a name="line.155"></a>
<span class="sourceLineNo">156</span><a name="line.156"></a>
<span class="sourceLineNo">157</span>    @Override<a name="line.157"></a>
<span class="sourceLineNo">158</span>    public void delete(T obj) {<a name="line.158"></a>
<span class="sourceLineNo">159</span>        this.getEntityManager().remove(obj);<a name="line.159"></a>
<span class="sourceLineNo">160</span>    }<a name="line.160"></a>
<span class="sourceLineNo">161</span><a name="line.161"></a>
<span class="sourceLineNo">162</span>    @Override<a name="line.162"></a>
<span class="sourceLineNo">163</span>    public T merge(T obj) {<a name="line.163"></a>
<span class="sourceLineNo">164</span>        return this.getEntityManager().merge(obj);<a name="line.164"></a>
<span class="sourceLineNo">165</span>    }<a name="line.165"></a>
<span class="sourceLineNo">166</span><a name="line.166"></a>
<span class="sourceLineNo">167</span>    @Override<a name="line.167"></a>
<span class="sourceLineNo">168</span>    public void refresh(T obj) {<a name="line.168"></a>
<span class="sourceLineNo">169</span>        this.getEntityManager().refresh(obj);<a name="line.169"></a>
<span class="sourceLineNo">170</span>    }<a name="line.170"></a>
<span class="sourceLineNo">171</span><a name="line.171"></a>
<span class="sourceLineNo">172</span>    @Override<a name="line.172"></a>
<span class="sourceLineNo">173</span>    public void detach(Object obj) {<a name="line.173"></a>
<span class="sourceLineNo">174</span>        this.getEntityManager().detach(obj);<a name="line.174"></a>
<span class="sourceLineNo">175</span>    }<a name="line.175"></a>
<span class="sourceLineNo">176</span><a name="line.176"></a>
<span class="sourceLineNo">177</span>// Session methods<a name="line.177"></a>
<span class="sourceLineNo">178</span><a name="line.178"></a>
<span class="sourceLineNo">179</span>    @Override<a name="line.179"></a>
<span class="sourceLineNo">180</span>    public void flush() {<a name="line.180"></a>
<span class="sourceLineNo">181</span>        this.getEntityManager().flush();<a name="line.181"></a>
<span class="sourceLineNo">182</span>    }<a name="line.182"></a>
<span class="sourceLineNo">183</span><a name="line.183"></a>
<span class="sourceLineNo">184</span>    @Override<a name="line.184"></a>
<span class="sourceLineNo">185</span>    public void setFlushMode(FlushModeType flushMode) {<a name="line.185"></a>
<span class="sourceLineNo">186</span>        this.getEntityManager().setFlushMode(flushMode);<a name="line.186"></a>
<span class="sourceLineNo">187</span>    }<a name="line.187"></a>
<span class="sourceLineNo">188</span><a name="line.188"></a>
<span class="sourceLineNo">189</span>    @Override<a name="line.189"></a>
<span class="sourceLineNo">190</span>    public void clear() {<a name="line.190"></a>
<span class="sourceLineNo">191</span>        this.getEntityManager().clear();<a name="line.191"></a>
<span class="sourceLineNo">192</span>    }<a name="line.192"></a>
<span class="sourceLineNo">193</span><a name="line.193"></a>
<span class="sourceLineNo">194</span>    @Override<a name="line.194"></a>
<span class="sourceLineNo">195</span>    public boolean isReadOnly() {<a name="line.195"></a>
<span class="sourceLineNo">196</span>        return TransactionSynchronizationManager.isCurrentTransactionReadOnly();<a name="line.196"></a>
<span class="sourceLineNo">197</span>    }<a name="line.197"></a>
<span class="sourceLineNo">198</span><a name="line.198"></a>
<span class="sourceLineNo">199</span>    @Override<a name="line.199"></a>
<span class="sourceLineNo">200</span>    public boolean contains(T obj) {<a name="line.200"></a>
<span class="sourceLineNo">201</span>        return this.getEntityManager().contains(obj);<a name="line.201"></a>
<span class="sourceLineNo">202</span>    }<a name="line.202"></a>
<span class="sourceLineNo">203</span><a name="line.203"></a>
<span class="sourceLineNo">204</span>// Type and cast methods<a name="line.204"></a>
<span class="sourceLineNo">205</span><a name="line.205"></a>
<span class="sourceLineNo">206</span>    /**<a name="line.206"></a>
<span class="sourceLineNo">207</span>     * Cast the given object to this instance's persistent instance type.<a name="line.207"></a>
<span class="sourceLineNo">208</span>     */<a name="line.208"></a>
<span class="sourceLineNo">209</span>    protected T cast(Object obj) {<a name="line.209"></a>
<span class="sourceLineNo">210</span>        return this.type.cast(obj);<a name="line.210"></a>
<span class="sourceLineNo">211</span>    }<a name="line.211"></a>
<span class="sourceLineNo">212</span><a name="line.212"></a>
<span class="sourceLineNo">213</span>    /**<a name="line.213"></a>
<span class="sourceLineNo">214</span>     * Cast the given list to a list of this instance's persistent instance type.<a name="line.214"></a>
<span class="sourceLineNo">215</span>     * Does not actually inspect the contents of the list.<a name="line.215"></a>
<span class="sourceLineNo">216</span>     */<a name="line.216"></a>
<span class="sourceLineNo">217</span>    @SuppressWarnings("unchecked")<a name="line.217"></a>
<span class="sourceLineNo">218</span>    protected List&lt;T&gt; castList(List&lt;?&gt; list) {<a name="line.218"></a>
<span class="sourceLineNo">219</span>        return (List&lt;T&gt;)list;<a name="line.219"></a>
<span class="sourceLineNo">220</span>    }<a name="line.220"></a>
<span class="sourceLineNo">221</span><a name="line.221"></a>
<span class="sourceLineNo">222</span>// Helper methods<a name="line.222"></a>
<span class="sourceLineNo">223</span><a name="line.223"></a>
<span class="sourceLineNo">224</span>    private TypedQuery&lt;T&gt; buildQuery(EntityManager em, String queryString, Object[] params) {<a name="line.224"></a>
<span class="sourceLineNo">225</span>        TypedQuery&lt;T&gt; query = em.createQuery(queryString, this.type);<a name="line.225"></a>
<span class="sourceLineNo">226</span>        if (params != null) {<a name="line.226"></a>
<span class="sourceLineNo">227</span>            for (int i = 0; i &lt; params.length; i++)<a name="line.227"></a>
<span class="sourceLineNo">228</span>                query.setParameter(i + 1, params[i]);<a name="line.228"></a>
<span class="sourceLineNo">229</span>        }<a name="line.229"></a>
<span class="sourceLineNo">230</span>        return query;<a name="line.230"></a>
<span class="sourceLineNo">231</span>    }<a name="line.231"></a>
<span class="sourceLineNo">232</span><a name="line.232"></a>
<span class="sourceLineNo">233</span>// Helper classes<a name="line.233"></a>
<span class="sourceLineNo">234</span><a name="line.234"></a>
<span class="sourceLineNo">235</span>    /**<a name="line.235"></a>
<span class="sourceLineNo">236</span>     * Convenience subclass of {@link QueryCallback} for use by DAO subclasses when returning lists of persistent instances.<a name="line.236"></a>
<span class="sourceLineNo">237</span>     */<a name="line.237"></a>
<span class="sourceLineNo">238</span>    protected abstract class DAOQueryListCallback extends TypedQueryCallback&lt;T, List&lt;T&gt;&gt; {<a name="line.238"></a>
<span class="sourceLineNo">239</span><a name="line.239"></a>
<span class="sourceLineNo">240</span>        @Override<a name="line.240"></a>
<span class="sourceLineNo">241</span>        protected final List&lt;T&gt; executeQuery(TypedQuery&lt;T&gt; query) {<a name="line.241"></a>
<span class="sourceLineNo">242</span>            return query.getResultList();<a name="line.242"></a>
<span class="sourceLineNo">243</span>        }<a name="line.243"></a>
<span class="sourceLineNo">244</span>    }<a name="line.244"></a>
<span class="sourceLineNo">245</span><a name="line.245"></a>
<span class="sourceLineNo">246</span>    /**<a name="line.246"></a>
<span class="sourceLineNo">247</span>     * Convenience subclass of {@link QueryCallback} for use by DAO subclasses when returning a single persistent instance.<a name="line.247"></a>
<span class="sourceLineNo">248</span>     *<a name="line.248"></a>
<span class="sourceLineNo">249</span>     * &lt;p&gt;<a name="line.249"></a>
<span class="sourceLineNo">250</span>     * Returns null if instance is not found.<a name="line.250"></a>
<span class="sourceLineNo">251</span>     */<a name="line.251"></a>
<span class="sourceLineNo">252</span>    protected abstract class DAOQueryUniqueCallback extends TypedQueryCallback&lt;T, T&gt; {<a name="line.252"></a>
<span class="sourceLineNo">253</span><a name="line.253"></a>
<span class="sourceLineNo">254</span>        @Override<a name="line.254"></a>
<span class="sourceLineNo">255</span>        protected final T executeQuery(TypedQuery&lt;T&gt; query) {<a name="line.255"></a>
<span class="sourceLineNo">256</span>            try {<a name="line.256"></a>
<span class="sourceLineNo">257</span>                return query.getSingleResult();<a name="line.257"></a>
<span class="sourceLineNo">258</span>            } catch (NoResultException e) {<a name="line.258"></a>
<span class="sourceLineNo">259</span>                return null;<a name="line.259"></a>
<span class="sourceLineNo">260</span>            } catch (EmptyResultDataAccessException e) {<a name="line.260"></a>
<span class="sourceLineNo">261</span>                return null;<a name="line.261"></a>
<span class="sourceLineNo">262</span>            }<a name="line.262"></a>
<span class="sourceLineNo">263</span>        }<a name="line.263"></a>
<span class="sourceLineNo">264</span>    }<a name="line.264"></a>
<span class="sourceLineNo">265</span><a name="line.265"></a>
<span class="sourceLineNo">266</span>    /**<a name="line.266"></a>
<span class="sourceLineNo">267</span>     * Convenience subclass of {@link CriteriaCallback} for use by DAO subclasses when returning lists of persistent instances.<a name="line.267"></a>
<span class="sourceLineNo">268</span>     */<a name="line.268"></a>
<span class="sourceLineNo">269</span>    protected abstract class DAOCriteriaListCallback extends CriteriaCallback&lt;T, List&lt;T&gt;&gt; {<a name="line.269"></a>
<span class="sourceLineNo">270</span><a name="line.270"></a>
<span class="sourceLineNo">271</span>        protected DAOCriteriaListCallback() {<a name="line.271"></a>
<span class="sourceLineNo">272</span>            super(AbstractDAO.this.type);<a name="line.272"></a>
<span class="sourceLineNo">273</span>        }<a name="line.273"></a>
<span class="sourceLineNo">274</span><a name="line.274"></a>
<span class="sourceLineNo">275</span>        @Override<a name="line.275"></a>
<span class="sourceLineNo">276</span>        protected final List&lt;T&gt; executeQuery(TypedQuery&lt;T&gt; query) {<a name="line.276"></a>
<span class="sourceLineNo">277</span>            return query.getResultList();<a name="line.277"></a>
<span class="sourceLineNo">278</span>        }<a name="line.278"></a>
<span class="sourceLineNo">279</span>    }<a name="line.279"></a>
<span class="sourceLineNo">280</span><a name="line.280"></a>
<span class="sourceLineNo">281</span>    /**<a name="line.281"></a>
<span class="sourceLineNo">282</span>     * Convenience subclass of {@link CriteriaCallback} for use by DAO subclasses when returning a single persistent instance.<a name="line.282"></a>
<span class="sourceLineNo">283</span>     *<a name="line.283"></a>
<span class="sourceLineNo">284</span>     * &lt;p&gt;<a name="line.284"></a>
<span class="sourceLineNo">285</span>     * Returns null if instance is not found.<a name="line.285"></a>
<span class="sourceLineNo">286</span>     */<a name="line.286"></a>
<span class="sourceLineNo">287</span>    protected abstract class DAOCriteriaUniqueCallback extends CriteriaCallback&lt;T, T&gt; {<a name="line.287"></a>
<span class="sourceLineNo">288</span><a name="line.288"></a>
<span class="sourceLineNo">289</span>        protected DAOCriteriaUniqueCallback() {<a name="line.289"></a>
<span class="sourceLineNo">290</span>            super(AbstractDAO.this.type);<a name="line.290"></a>
<span class="sourceLineNo">291</span>        }<a name="line.291"></a>
<span class="sourceLineNo">292</span><a name="line.292"></a>
<span class="sourceLineNo">293</span>        @Override<a name="line.293"></a>
<span class="sourceLineNo">294</span>        protected final T executeQuery(TypedQuery&lt;T&gt; query) {<a name="line.294"></a>
<span class="sourceLineNo">295</span>            try {<a name="line.295"></a>
<span class="sourceLineNo">296</span>                return query.getSingleResult();<a name="line.296"></a>
<span class="sourceLineNo">297</span>            } catch (NoResultException e) {<a name="line.297"></a>
<span class="sourceLineNo">298</span>                return null;<a name="line.298"></a>
<span class="sourceLineNo">299</span>            } catch (EmptyResultDataAccessException e) {<a name="line.299"></a>
<span class="sourceLineNo">300</span>                return null;<a name="line.300"></a>
<span class="sourceLineNo">301</span>            }<a name="line.301"></a>
<span class="sourceLineNo">302</span>        }<a name="line.302"></a>
<span class="sourceLineNo">303</span>    }<a name="line.303"></a>
<span class="sourceLineNo">304</span>}<a name="line.304"></a>
<span class="sourceLineNo">305</span><a name="line.305"></a>




























































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